You right-click the installer and "Run as Administrator," hoping a little extra authority will force the files into place.

Press Enter and let the system scan and repair corrupted files. 3. Re-register ISDone.dll and Unarc.dll

Windows 10 64-bit requires specific file architectures. Downloading an incorrect or outdated 32-bit version of the DLL will break the installation system entirely.

Next, type the following command to repair the system image: DISM /Online /Cleanup-Image /RestoreHealth

Select your system drive (usually C:) and choose .

Under the tab, click Settings in the Performance section.

After installation, verify the file exists

If the ISDone.dll file or its dependencies are corrupted, the built-in Windows Deployment Image Servicing and Management (DISM) and System File Checker (SFC) tools can repair them automatically. Type in the Windows search bar. Right-click Command Prompt and select Run as administrator .

Go to the tab in the new window and click Change under Virtual memory .

Open the , click Settings (gear icon), and navigate to Update & Security > Windows Security . Click Virus & threat protection .

When searching for a fix, many search results recommend downloading a separate isdone.dll file from third-party websites and pasting it into system folders like System32 or SysWOW64 .

Always obtain isdonedll from the official Internet Download Manager installer or a trusted Microsoft-certified source .